Air flow sensor and detecting method

Details Air flow sensor and detecting method Air flow sensor and detecting method

1991-03-18

1993-05-25

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

7320414, G01F 168

Patent

active

052129837

ABSTRACT:
A pair of thermistors are mounted in a tube which diverts a minor portion of the air flowing through a duct of an HVAC system. One thermistor is heated by a feedback control system to maintain a substantially constant temperature differential between the thermistors. A signal representing the flow velocity is detected by detecting the power which is applied to the heating body to maintain the constant differential. That power represents the thermo power being carried away from the heated body. The temperature of the unheated thermistor is also detected. The signals are converted to digital form and applied to a computer for computing the flow rate in the ducts.

REFERENCES:
patent: 2552017 (1951-05-01), Schwartz
patent: 2650496 (1953-09-01), Middleton et al.
patent: 2726546 (1955-12-01), King, Jr.
patent: 3363462 (1968-01-01), Sabin
patent: 3595079 (1971-07-01), Grahn
patent: 4059982 (1977-11-01), Bowman

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